Ozone is an immune stimulator and can be used IV or intranasally or topically. It is bacteriocidal, and kills fungus and viruses as well. You can nebulize a horse that has pneumonia to help kill the bacteria in his lungs and oxygenate the tissue. An ozone machine is like a mini-hyperbaric chamber and can have wonderful effects on infected tissues. Infected or gangrenous wounds can be bagged with the ozone machine as well.
Below is an example of horse that underwent ozone therapy treatment for a wound in 2005.